A REAL-WORLD EXAMPLE OF CELLULAR RESPIRATION WHITE MEAT OR DARK MEAT - MUSCLES 8 CELLULAR RESPIRATION Many animals, including humans and turkeys, have two types of muscle fibers:slow (slow twitch) fibers and fast (fast twitch) fibers. Slow muscle fibers are muscle cells that can sustain repeated, long contractions but don't generate a lot of quick power for the body. They are bullt for endurance.Fast muscle fibers are cells that can contract more quickly and powerfully than slow fibers but fatigue more easily. They function best for short bursts of Intense activity. All human muscles contain both slow and fast muscle fibers, but muscles differ in the percentage of each. The percentage of each fiber type in a particular muscle also varies genetically from person to person.Training can't turn one kind of muscle into the other, but can help in overall performance, lung capacity, heart efficiency etc. What makes these two types of muscle fibers perform so differently? How they are built is the short answer. This differing structure also determines which type of cellular respiration is preferred by each: slow fibers break down glucose aerobically (with oxygen)while fast fibers work anaerobically (without oxygen). Slow Fibers: Have MANY mitochondria Contain myoglobin (red oxygen carrying pigment stored in muscles - provides reddish color of muscles in dark meat of turkey) Thin (better surface area to volume ratio) More oxygen=more energy Fast Fibers: Fewer mitochondria Less myoglobin Thick (makes them more powerful) Lactic acid builds more quickly After reading the background Information above answer the following Questions: For which track event would a person with a larger percentage of fast twitch muscle fibers be more suited? Why? For which track event would a person with a larger percentage of slow twitch muscle fibers be more suited? Why? Which body parts of the turkey are considered white meat? Which muscle fiber is dominant here ? Explain how this type of muscle fiber helps each of these parts function in the life of a turkey. Which body parts of the turkey are considered dark meat? Which muscle fiber is dominant here?Explain how this type of muscle fiber helps each other the parts function in the life of the turkey.

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A REAL-WORLD EXAMPLE OF CELLULAR RESPIRATION WHITE MEAT OR DARK MEAT - MUSCLES 8 CELLULAR RESPIRATION Many animals, including humans and turkeys, have two types of muscle fibers:slow (slow twitch) fibers and fast (fast twitch) fibers. Slow muscle fibers are muscle cells that can sustain repeated, long contractions but don't generate a lot of quick power for the body. They are bullt for endurance.Fast muscle fibers are cells that can contract more quickly and powerfully than slow fibers but fatigue more easily. They function best for short bursts of Intense activity. All human muscles contain both slow and fast muscle fibers, but muscles differ in the percentage of each. The percentage of each fiber type in a particular muscle also varies genetically from person to person.Training can't turn one kind of muscle into the other, but can help in overall performance, lung capacity, heart efficiency etc. What makes these two types of muscle fibers perform so differently? How they are built is the short answer. This differing structure also determines which type of cellular respiration is preferred by each: slow fibers break down glucose aerobically (with oxygen)while fast fibers work anaerobically (without oxygen). Slow Fibers: Have MANY mitochondria Contain myoglobin (red oxygen carrying pigment stored in muscles - provides reddish color of muscles in dark meat of turkey) Thin (better surface area to volume ratio) More oxygen=more energy Fast Fibers: Fewer mitochondria Less myoglobin Thick (makes them more powerful) Lactic acid builds more quickly After reading the background Information above answer the following Questions: For which track event would a person with a larger percentage of fast twitch muscle fibers be more suited? Why? For which track event would a person with a larger percentage of slow twitch muscle fibers be more suited? Why? Which body parts of the turkey are considered white meat? Which muscle fiber is dominant here ? Explain how this type of muscle fiber helps each of these parts function in the life of a turkey. Which body parts of the turkey are considered dark meat? Which muscle fiber is dominant here?Explain how this type of muscle fiber helps each other the parts function in the life of the turkey.

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1. **For which track event would a person with a larger percentage of fast twitch muscle fibers be more suited? Why?** A person with a larger percentage of fast twitch muscle fibers would be more suited for short-distance sprinting events, such as the 100-meter dash. This is because fast twitch fibers can contract quickly and powerfully, providing the explosive strength needed for short bursts of intense activity. 2. **For which track event would a person with a larger percentage of slow twitch muscle fibers be more suited? Why?** A person with a larger percentage of slow twitch muscle fibers would be more suited for long-distance running events, such as marathons. Slow twitch fibers are built for endurance and can sustain repeated, long contractions, making them ideal for activities that require prolonged effort. 3. **Which body parts of the turkey are considered white meat? Which muscle fiber is dominant here? Explain how this type of muscle fiber helps each of these parts function in the life of a turkey.** The breast and wings of a turkey are considered white meat. Fast twitch muscle fibers are dominant in these areas. These fibers help turkeys perform quick, powerful movements, such as flapping their wings to escape predators or during short flights. 4. **Which body parts of the turkey are considered dark meat? Which muscle fiber is dominant here? Explain how this type of muscle fiber helps each of these parts function in the life of the turkey.** The legs and thighs of a turkey are considered dark meat. Slow twitch muscle fibers are dominant in these areas. These fibers allow turkeys to sustain long periods of walking and standing, which is essential for foraging and moving around their environment. The presence of myoglobin in these muscles provides the reddish color and supports aerobic respiration, enabling endurance.

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